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A force `(F) = - 5 hati - 7hatj + 3hatk` acting on a particles causesa displacement
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A force `(F) = - 5 hati - 7hatj + 3hatk` acting on a particles causesa displacement `(s) = 3hati - 2hatj + ahatk`n its own direction. If the work done is 14 J, then the vaule of 'a' is